Connect Postmark to MailNesto
Fast, reliable delivery for transactional and marketing streams.
Postmark and MailNesto, together
Postmark is known for fast delivery of the emails people are waiting for: OTPs, receipts, password resets. Connect it as a delivery server in MailNesto with a server API token and your transactional email, campaigns and automations can go out through it.
Postmark keeps transactional and bulk mail in separate message streams, and MailNesto’s own setup note recommends a Broadcast stream for marketing email. Its webhooks report bounces and spam complaints back so addresses are suppressed automatically.
What moves between Postmark and MailNesto
Sent through smtp.postmarkapp.com on port 587, with the same server API token as both username and password. Default speed is 10 emails a second.
Hard bounces, bad addresses, blocked and manually deactivated recipients suppress the address; other bounce types count as soft.
Spam complaint records mark the contact as complained and add them to your suppression list.
Connect Postmark in a few minutes
- 1
Get the token
In Postmark open your server, check which message stream should carry this mail, and copy the server API token.
- 2
Add the server
In MailNesto open Sending → Servers & routing → Add server → Postmark. Paste the token in both fields and save. The connection is tested before you send anything.
- 3
Add the webhook
Copy the Postmark URL from the “Bounce & complaint webhooks” card and add it as a webhook in Postmark for bounces and spam complaints.
- 4
Authenticate
Tick Postmark in the SPF builder to add include:spf.mtasv.net, and check DKIM and DMARC under Deliverability.
What you can do with it
Limit the Postmark server to a From domain such as account.yourbrand.com used by your transactional API calls, while campaigns from yourbrand.com go through another server.
Send order receipts through the transactional API. The message log in MailNesto shows each message’s status, opens, clicks and exact content, and Postmark bounces mark it as bounced.
Keep Postmark as a second server at priority 2 so time-sensitive mail still goes out if your main server fails.
Questions about the Postmark integration
Can I use Postmark for marketing campaigns?
Postmark expects bulk mail on a Broadcast stream. Follow Postmark’s rules for that stream, and use the server’s From-domain limit or per-campaign server choice to control which mail goes through it.
Does transactional email keep flowing if marketing is paused?
Yes. Transactional mail is sent on its own stream in MailNesto and keeps going when marketing sending is paused.
What happens to soft bounces?
They are recorded but don’t suppress the address straight away. Three soft bounces in 30 days mark it as bounced.
Why does the test fail?
Most often the token belongs to a different server, or it was pasted in only one field. Paste the same server API token in both.
Can I send a test email through Postmark only?
Yes. “Test connection” on the server checks the login and, if you enter an address, sends a test email through that server alone, so you can see it arrive before any real mail goes out.